Abstract

The compounds containing lutetium and tungsten atoms have large effective atomic number (Zeff) and high stopping ability for high energy radiation because both lutetium and tungsten atoms are heavy with large atomic number. In order to obtain a new red-emitting phosphor with high efficiency for X-ray detection, the trivalent europium ion (Eu3+) activated alkaline double tungstate phosphor NaLu(WO4)2:Eu3+ was prepared by high temperature solid state reaction. The crystalline structures of synthesized phosphor were determined by powder X-ray diffraction (XRD) and elucidated using Topas Academic software, and the morphologies were characterized by thermal field emission scanning electron microscopy (SEM) combined with energy-dispersive X-ray spectroscopy (EDS). The Rietveld structural refinement results suggest that the cell parameters become larger with the increasing of Eu3+ doping concentration. The emission spectra of NaLu(WO4)2:Eu3+ under UV and X-ray radiation were measured, respectively. It was observed that this micro-particle phosphor shows intensive red emission under X-ray radiation, which implies that NaLu(WO4)2:Eu3+ phosphor has potential application for X-ray detection.

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